Random number generation code not working [Probably a stack overflow]

This C code should generate 1 million random numbers, why is does it stop working during the execution process?

The libraries used are stdlib, stdio.h, and time.h

 int main()
    {




    FILE *ofp;
     int k=0, i=1000000;;
    int array[i];


    ofp=fopen("output.txt","w");
        while (ofp==NULL)
        {
     printf("File is corrupted or does not exist, \nplease create or fix the file and press enter to proceed");
            getchar();
    }



 srand(time(NULL));
rand();


for (k=0;  k<1000000; k++)
    {
    array[k] = rand()%100;
    fprintf(ofp, "%d\n", array[k]);
    }


return 0;
}